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Concept
Reason (argument)
Résumé
In the most general terms, a reason is a consideration which justifies or explains an action, a belief, an attitude, or a fact.
Normative reasons are what people appeal to when making arguments about what people should do or believe. For example, that a doctor's patient is grimacing is a reason to believe the patient is in pain. That the patient is in pain is a reason for the doctor to do things to alleviate the pain.
Explanatory reasons are explanations of why things happened. For example, the reason the patient is in pain is that her nerves are sending signals from her tissues to her brain.
A reason, in many cases, is brought up by the question "why?", and answered following the word because. Additionally, words and phrases such as since, due to, as, considering (that), a result (of), and in order to, for example, all serve as explanatory locutions that precede the reason to which they refer.
In philosophy, it is common to distinguish between three kinds of reason.
Normative or justifying reasons are often said to be "considerations which count in favor" of some state of affairs (this is, at any rate, a common view, notably held by T. M. Scanlon and Derek Parfit).
Explanatory reasons are considerations which serve to explain why things have happened or why states of affairs are the way they are. In other words, "reason" can also be a synonym for "cause". For example, a reason a car starts is that its ignition is turned. In the context of explaining the actions of beings who act for reasons (i.e., rational agents), these are called motivating reasons—e.g., the reason Bill went to college was to learn; i.e., that he would learn was his motivating reason. At least where a rational agent is acting rationally, her motivating reasons are those considerations which she believes count in favor of her so acting.
Some philosophers (one being John Broome) view normative reasons as the same as "explanations of ought facts". Just as explanatory reasons explain why some descriptive fact obtains (or came to obtain), normative reasons on this view explain why some normative facts obtain, i.
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